Nonlinear Soil Behavior at KiK-net Togi Observation Site during the 2024 Noto Hanto Earthquake

Abstract

We conducted NIOM analysis for the earthquake records at the KiK-net Togi (ISKH04) site and examined nonlinear behavior of the ground at the site during the 2024 Noto Hanto earthquake. The results revealed that (1) the propagation time increased to 0.3136 s (NS) and 0.3245 s (EW) from the values before the mainshock of 0.2365 s and 0.2333 s, respectively; (2) propagation times at the last part of the mainshock records were still larger than those before the mainshock by 6 to 6.5 %; and (3) the SHAKE91 analysis indicated the significant nonlinear behavior in the soil layer from GL-28 to -50 m.